// eslint-disable-next-line require-jsdoc
function pluralize (time, label) {
  if (time === 1) {
    return time + label;
  }
  return time + label + "s";
}

/**
 * 日期格式化
 */
// eslint-disable-next-line require-jsdoc
export function dateFormat (date) {
  let format = "yyyy-MM-dd hh:mm:ss";
  if (date !== "Invalid Date") {
    var o = {
      "M+": date.getMonth() + 1, // month
      "d+": date.getDate(), // day
      "h+": date.getHours(), // hour
      "m+": date.getMinutes(), // minute
      "s+": date.getSeconds(), // second
      "q+": Math.floor((date.getMonth() + 3) / 3), // quarter
      "S": date.getMilliseconds() // millisecond
    };
    if (/(y+)/.test(format)) {
      format = format.replace(RegExp.$1,
        (date.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o) {
      if (new RegExp("(" + k + ")").test(format)) {
        format = format.replace(RegExp.$1,
          RegExp.$1.length === 1 ? o[k] :
            ("00" + o[k]).substr(("" + o[k]).length));
      }
    }
    return format;
  }
  return "";
}

// eslint-disable-next-line require-jsdoc
export function timeAgo (time) {
  const between = Date.now() / 1000 - Number(time);
  if (between < 3600) {
    return pluralize(~~(between / 60), " minute");
  } else if (between < 86400) {
    return pluralize(~~(between / 3600), " hour");
  } else {
    return pluralize(~~(between / 86400), " day");
  }
}

// eslint-disable-next-line require-jsdoc
export function parseTime (time, cFormat) {
  if (arguments.length === 0) {
    return null;
  }

  if ((time + "").length === 10) {
    time = +time * 1000;
  }

  const format = cFormat || "{y}-{m}-{d} {h}:{i}:{s}";
  let date;
  if (typeof time === "object") {
    date = time;
  } else {
    date = new Date(parseInt(time, 10));
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  };
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key];
    if (key === "a") {
      return ["一", "二", "三", "四", "五", "六", "日"][value - 1];
    }
    if (result.length > 0 && value < 10) {
      value = "0" + value;
    }
    return value || 0;
  });
  return time_str;
}

// eslint-disable-next-line require-jsdoc
export function formatTime (time, option) {
  time = +time * 1000;
  const d = new Date(time);
  const now = Date.now();

  const diff = (now - d) / 1000;

  if (diff < 30) {
    return "刚刚";
  } else if (diff < 3600) { // less 1 hour
    return Math.ceil(diff / 60) + "分钟前";
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + "小时前";
  } else if (diff < 3600 * 24 * 2) {
    return "1天前";
  }
  if (option) {
    return parseTime(time, option);
  } else {
    return d.getMonth() + 1 + "月" + d.getDate() + "日" + d.getHours() + "时" + d.getMinutes() + "分";
  }
}

/* 数字 格式化 */
// eslint-disable-next-line require-jsdoc
export function nFormatter (num, digits) {
  const si = [
    { value: 1E18, symbol: "E" },
    { value: 1E15, symbol: "P" },
    { value: 1E12, symbol: "T" },
    { value: 1E9, symbol: "G" },
    { value: 1E6, symbol: "M" },
    { value: 1E3, symbol: "k" }
  ];
  for (let i = 0; i < si.length; i++) {
    if (num >= si[i].value) {
      return (num / si[i].value + 0.1).toFixed(digits).replace(/\.0+$|(\.[0-9]*[1-9])0+$/, "$1") + si[i].symbol;
    }
  }
  return num.toString();
}

// eslint-disable-next-line require-jsdoc
export function html2Text (val) {
  const div = document.createElement("div");
  div.innerHTML = val;
  return div.textContent || div.innerText;
}

// eslint-disable-next-line require-jsdoc
export function toThousandslsFilter (num) {
  return (+num || 0).toString().replace(/^-?\d+/g, m => m.replace(/(?=(?!\b)(\d{3})+$)/g, ","));
}
